Bump postgresql from 42.2.20 to 42.2.21 (#2350)

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.2.20 to 42.2.21.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/REL42.2.21/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.2.20...REL42.2.21)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -910,7 +910,7 @@
         <dependency>
             <groupId>org.postgresql</groupId>
             <artifactId>postgresql</artifactId>
-            <version>42.2.20</version>
+            <version>42.2.21</version>
             <optional>true</optional>
         </dependency>